Sastrugi head on the East Antarctica plateau. Sastrugi are features shaped by the powerful Antarctica winds which can reach speeds exceeding 300km/h in wintertime. The winds shred the ice, one particule of ice at a time. Because cold wind has mass and therefore follows gravity, ondulations or sloping in the terrain generates greater wind speed. Those winds are called katabatic and provide consistent wind direction. As a result a valley will likely be torn to shred, while a hilltop can be comparatively smooth. The variations in elevation can be very subtle so as to make them barely perceptible, all the more so from the lack of shadow in an all white environment. •
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